You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Interesting concept, useful for large open-space events. Struggling to see how it would work for residential addresses... turning up on scene and asking ‘anyone know where ///fact.slip.pokers is’? @what3wordshttps://twitter.com/what3words/status/1108673471616294912 …
Even in cities and built up areas where addressing works okay, it’s far from perfect. For example there are 8 different Lonsdale Roads in London, which is very confusing! Have you tried the app out? 
http://qtrh4.app.goo.gl/TWB
